Pressure gauge assembly



May 4, 1948. L. HoRNBosTEL 2,440,718

I YRESSURE GAUGE ASSEMBLY Filed April 10, 1944 3 Sheets-Sheet l :EE- 4.7/ l 34" 222i Z6 8.3 7 Y 77 L-.. /9 l 26a HHII Illlll'llllvll'll'll'lllll" j, ummm y j. my

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May 4, 1948. I .HRNBosTr-:L

PRESSURE GAGE ASSEMBLY Filed April l0, 1944l '3 Sheets-Sheet 2 May 4,1948 L.. HRNBOSTEL.

-` PRESSURE GUGE ASSEMBLY Filed April 10, 1944 l 5 Sheets-Sheet I5 im@me 4 ne,

` TU'NITD gsrA'ras PATENT omer N rarissima canon Assanmvr ima nunmal.nena. wie. enuma nena Iron Works. Beloit. Wil.,` a corporation o! Wia-Harkema lim-u 1o. massaal Ne. sacs-:z

This invention relates to a pressure gauge as semblyandit is especiallydirectecito a gauge assembly including arsack subjected to pressure.that is readily lled .with liquid and purged of air to utilizenoncompressible liquid as a pressure transfer medium to actuate apressure The invention is herein disclosed as applied to l,

' the pressure rolls of a paper making machine,

but it is not intended toV limit the structure to 'this type of machinesince the improvements are equally applicable vto many types ofapparatus.

It is one of the principal objects of this in vention. to simplify theconstruction of a pressure gauge assembly such as contemplated hereinand to improve the emciency, operation and dependability of suchassembly. d* Another principal object hereof resides in providing apressure gauge assembly wherein the device mayl be recharged withpressure fluid in the event there is leakage of the fluid from thestructure. and to perform this operation without l stopping the machine.

A further principal object oi' this invention is I Still another objectis to provide means wherel by entrapped air may be evacuated from a,re--l Vceptacle for the hydraulic pressure fluid after l the receptaclehas been charged with the fluid.

- Another oblecthereoi resides in the provision of a pressure gaugeassembly having an`espe cially designed hydraulic pressure chamber orfluid reservoir that is of disk-like shape to be disposed with its axislin a plurality of angular positions depending upon the requirement ofany particular installation. In this connection the reservoir Yl'iasmeans incorporated in it for providing sumps to entrap air regardless ofthe position of the structure, thus facilitating the evacuation of theentrapped airduring the replacement oi' the hydraulic fluid in thechamber or subsequentthereto.- u

It is a further object hereof to provide `an elastic sack or'bag thatconstitutes the hydraulic fluid reservoir. such sack or bag havinganannular or peripheral sump and axial top and bot- 's claim. (ci. 'za-141i 2 charging of the container so that the air may be readilyevacuatedaiter the reservoir has been illled with fluid.

Another object resides in' providing control means whereby thegauge orindicator unit may ,be removed for checking it or. for replacement whilethe machine is in operation and without reducingthe amountof pressure inthe pressure fluid` reservoir so that it will not eiiect the con--tacting relationship betweenthe two pressure rollers. I,

'I'he present invention also contemplates the provision of means in apressure gauge assembly for maintaining the opposing rollers of a papermaking machine in proper cooperation with respect 'to each other in theevent of breakage of the indicator or gauge so that the machine maycontinue its operation even. though the indicator is out of operation.Also the arrangement provides for the removal and replacement of theelastic sack or bag without interfering-with the operation of themachine. In the instant assembly the rolls may b e readily separated forvarious reasons andmay then be restored to their desired opposingpositions where they will be again pressed into opposition to each otherunder the y same amount of pressure at which they were previouslyoperating.

, Additional objects, aims and advantages of the invention contemplatedherein will be apparent to personsv skilled in the art after theconstruction and operation of the pressure gauge assem-v bly is`understood from the within description.

It is preferred to accomplish theV numerous lobjects `oi.' Vthisinvention and to practice the Vmanner hereinafterv same insubstantiallyjjt fully described andv asin Lparticularly pointed Y outin the claims. Reference' is now made to the tom sumps" for entrappingair during the re.

accompanying drawingsthat are a part hereof.

Figure 1 is a front end elevation of a press roll unit for a papermaking or other machine, showing the instrumentalities of the inventionincorporated thereon; v

Figure 2 is an enlarged vertical section through the axis of the thrustor pressure generating devicesthat are shown at the right upperv portioni line 3 3 on Figure 5, showing the pressure chamber and iluidreservoir, the cylinder and the piston disposed with their axeshorizontal;

Figure 4 is a fragmentary view similar to Fig ure 3 showing the `partswhen their axes are in linflligur'e 3 vwith portions thereof inhorizontal sectioml l Figure 6 is a sectional diagram taken axially Ythrough the elastic sack for the pressure -iiuid Y and showing the sameexpanded by the iiuid" and prior to the purgingA of the entrapped airtherefrom Figure '1 is a similar diagramsnowing the-sack V restored toits operating position alter the purgor less ,of a schematic characterand are for the purposefof disclosing a typical or preferred form of theimprovements contemplated herein.

Referring rst to Figure 1 it will be seen. the

ixed roll I0 is carried in end bearings on a stationary pedestal |2,'andthe movable roll I3 20 is carried in end bearings i4 on the upper endsof swinging supports I5 that are fulcrumed at their lower ends on apivot rod I8. These swinging supports AI5 are provided with shoes' iladapted for engagement with the anchored bases t8 to prevent'movementoi' the roll- |'3 and its supporting arms I5 too far away from the fixedroll l 3. Spaced brackets i3, best shown in Figure 5, are bolted to theupper portions ci the end vthatis adapted to be screwed into thecoupling to engage a seat 44 at the adjacentlinner end. l of the bore otthe aline'd stub 39 to close the bore vThe valve stem 43 is employed toshut off flowA I of pressure fluid to the gauge whenever it is desiredto replace the gauge or ll an elastic reservoir in the compressionchamber 3|, and the normalposition of this valve stem is within thecentral enlarged portion 46 in the bore of the 'lf-coupling. As shown inFigure 3, the outer end ci the valve stem i3` projects beyond thecoupling 31 and it is protected by a suitable cap 4l gto preventtampering with it.

The tube is disposed in the open bore 30 of the cylinder head 21as`shown in Figures 3 and 4. The seat 33 in the cylinder head is adaptedto receive a washer 48 having an edge flange 49, the exterior surfacesof said washer and flange being adapted to snugly iit the seat 33. Thein- VVner end of the tube 60 is enlarged to provide a disk that has athreaded recess 5| of larger diameter than the bore 4| of the tube. Theaxial portion of the washer 48 has an opening 52 bearings tirar thefixed roll ic, and have bored 30 of larger diameter than the tube 40 andthe adbosse's 2@ to receive the ends of a wrist pin 3| that provides asupport for at least a portion ci the pressure gauge assembly.

The pressure gauge-assembly comprises a hollow cylinder t2 the sides Vofwhich are provided 35 with slots 23-that are 'of a width to accommodatethe wrist pin 2| and are slightly longer than 7 the diameter of saidwrist pin to permit. the cyl-y inder to be moved transverse to the wristpin.

The end'of "the cylinder `that vis nearest the axis oi the movable roll|3'h'as an end wall 24 that is provided with a boss 25 having a threadedbore into which a thrust rod 26 is screwed and pinned.

jacent portion of the tube is provided with threads 53 upon which atightening nut 54 is screwed to draw'the disk 5d of the tube toward thewasher d8 and anchor it thereto.

An elastic fluid reservoir or sack is disposed in the cylinder head infront of the` piston 32 and is adapted to be compressed whenever thereis relative movement between the cylinder and piston. This elasticreservoir or sack 55 may be i0 of a suitable grade of rubber orsynthetic rubber -that is capable of withstanding the reaction of oil orother hydraulic fluid with which the reservoir is charged. The exterior,surface of this reservoir is generally cylindrical and pre- The otherend 0f` this thrust rod 2g ex, 45 erably it is a counterpart of thesurfaces of the tends to and beyond the pressure creating means that aremountedupon the movable roll end bearing I4 as shown in Figure 1. Theotherl end of cylinder 22 is closed by a head 21 that' is secured to theflanged end 23 of the cylinder by bolts 29. The interior of this head 2lis hollow and its outer-axial portion is provided with a bore 3D thatextends through it. The widest portion of the interior of the hollowhead 21 comcylinder head that are engaged `thereby. when 50., When thetightening nut 54 is screwed up against the washer 48 the-neck portion56 of the prisesf a, commessi@ chamber 3! that registers 55 reservoirwill be securely heldin position bewith and is of the same diameter asthe interior bore'of the cylinder y22 which permits the cooperatingpiston 32 to be disposed with its ad jacent and portion in this chamber.Between tween the disk 50 and washer 48, as shown in Figures '3 and 4. t

' The linterior of the elastic reservoir 55 is formed to provide aplurality of sumps wherein air will the chamber 3|v and the open bore aoof the head o0 be entrapped .during the charging of the reserthere is areduced portion 33 that constitutes a seat for a portion of a pressurefluid reservoir.

The gauge device or indicator 3S may be of any suitable type and has athreaded stub 33 voir with the hydraulic pressure medium. The

innersurface 51a of the wall that extends away 1jr-om the disk 50 isoblique so that a disk-shaped interior chamber increases in depth. fromthe that is screwed into the lateral stub at of a rperiphery toward `theaxis of the elastic reservoir coupling 31, and the bore 38 ofsaid stubcommunicates with the longitudinal bore of the T- coupling. Another stub.89 of the T-coupling is exteriorly threaded and screwed into a tube d@I the bore 4| of which ,is in communication with 79 the interior of thecompression chamber 3| as will be later explained.

The third stub 42 ofthe coupling 37, that aligns with the stub 33, has athreaded bore to receive the threaded portion of a shut-oir valve steinit or sack to provide a radially disposed annular n sump 59. 'Ihe axialportion of the circular inner wall 58 ofthe reservoir is recessed toprovide an axial sump 59a and the proximate end face of piston 32,against which this inner wall 58 is engaged, has a depression 60 toreceive an faxial.

ly therein so that y such that the cylinder and 1 end of this tube 62awill A `Should this last versed to position thedialabove the vertically02, nor Vthe ll, however.v

pipe 82a. will be employed.

- the elastic reservoir stem Il is screwed into `voir than is normallyused during the recessesl ure are with liquid as illustrated in Figureh6, sufficient liquid is introduced to stretch v bleed back sulilcientliquid for mounted upon the upper support il for a movable rolll). saidmeans be f andere:

is shaped -to formaeounterpart of the surface of the compression chamberll and is 'fitted snugit is ailected by any relative the piston andcylinder.

An L-shaped pipe llhaving'a threaded. end is movement between 'j screwedintothe threaded recess Il in the cisl; u approximately the same 50 andit has a bore diameter as the lhere istered therewith. i in Figure 3 tispositioned in the top segment of the annular sump Il where it will'beeffective M of the tube ll. and is regto evacuate ehtrapped air from theadjacent por,-

tion of the reservoir-in the manner to b e later described herein.

In the arrangement just described. the axis of lcylinder 22 ishorizontal. the dial I4 vertically disposed. and the pipe O! has its endin the top of the reservoir to evacuate entrapped air therein. as shownin Figure 3. If theinstallation is other parts have their axes in avertical plane wherein the dial Il and its support I1 are pendant asshown in Figure 4, a straight tube 02a will be substituted in lieu ofthe angular tube"$2` before described so that the open into the axialsump 58a to evacuate described arrangement be redispOsed cylinderneither the pipe A sump will be formed by the neck or throat portion of.

VIl which will be uppermost. as shown in Figure 8. i Whenever it isdesired to replace theindicator device 34 orto remove it for repair. thevalve I its seat 44 tov close the passageway leading into the reservoirto retain the liquid therein under its operating pres sure. Theindicator ll is removed from its socket 3l and repaired orfr'eplacedwith another device.

it is desired to replenish or recharge the f When liquid, the valve stemIl is seated and the indicator removed so that acoupling 6I, of the hose68 of a pressure screwgun may be screwed into the stub I! from which theindicator has been removed, (Figure 6). The va'lve stem 43 is nowunseated and the pressure gun operated to discharge hydraulicV liquidinto thereseri'l'oir i5. It is preferred to force more liquid into thereseroperation lin order that all air or other compressible fluid can bepurged fromthe system. In normal operation the wrist pin is midwaybetween the ends of 23 and equalspaces A and B (Figprovided. Whencharging the sack and this closes or decreases the space B between thepin 2 i and end wall of the recess.- When suf-l ficient fluid has beendischarged through the recess iil or pipe 82 `or pipe 82a (dependingupon the position of the assembly) the valve stem I3 is again seatedandthe pressure gun hose un' coupled, whereupon the valve may be crackedto purging the air from the (sack and for-allowing ythe deformed orstretched sack to recede so -as to'reclaim the spaces B. The valve isagain closed. the gauge screwed in position.

der and piston ing shown generally in Figure l( and in enlarged The freeend of the pipe Il Y of the worm gear and the adjacent face of the hbearing boss 1,2, and the otherface of the worm gear 1I isy engagedagainstthe inner face of theY bearing boss 1I. f

A worm 1B iskeyed or otherwise secured to the transverse shaft 1| in;mesh with the worm gear 1|/ and said shaft 1I projects out of its'frontbearin and beyondthe housins ,10 where it has a hand wheel 11'secured toit 4 for rotating said shaft and thegearingwithin the entrapped airtherefrom.

5B and the threaded recess upon to slide the housing 1li to effect alongitudinal movement of the thrust rod I0'.

. The housing 1U has a; casing portion 18 projecting beyond bearing 12in a direction toward the pressure gauge assembly on'the nxed rollsupport or bearing li. A spring 'il is positioned within the casing 18and' projects beyond the outerend thereof to engage a follower device l0that is carried' by, but isfree upon, the adjacent vportion of the`tension rod 2l. This follower device 80 is hollow as shown in Figure 2and it is spaced from the adjacent end of the casing 18. The spacebetween the casing 18 and the follower Bil is closed by a shield lli ofcylindrical shape that is anchored to the casing by screws I2 and hasits outer portion telescoped on the outer surface of the cylinx dricalportion of the follower l0.

An abutment or stop 8l arises from the roll l end bearing Il and has all-shaped recess M in .pressure creating devices to the swinging move- Yor defonn the sack and the valve opened to allow the fluid to act on thegauge. The means for applying pressure to the cylincomprise thestructure that is Y portion of the swinging i 'lapse the sack and flowliquid therein its face next the follower l0.' There are preferably twoof these abutments or stops BI, one beingon each side of the rod 26 tobe engaged by spaced and tapered projections IB on the end face of thefollower that enter 4the recesses 84. This arrangement accommodates thetension or ment of the fulcrumed support i6 press roll I3.V `1

By turning the hand wheel 11in proper direction the worm gear 1l isadapted to wind upon the thread 26a of the thrust rod 26 in a directionso that the rod will exert a pull upon the cylinder 22 for the movableat its oppositegend, tending to move the cylinder relative to th'e 'pinY 2| and piston 31, thereby exerting pressure on the sack iii` tendingto colintoV the gauge 34 to indicate the pressure. This pull upon therod 28 is transmitted through the gear housing 10 and spring 1,9 to thefollower 80 that is en gaged with theabutment or stop 83 on the ful'-crumed support I4 for the movable press roll li,

and the latter will thereby` be pressed toward and4 against the otherrollill that has a The turning of the, hand wheel 11 is continued" untilthe desired contact pressure has been attained between therolls-asgindicated `on the dial of the gauge.

The cylinder, piston anduid reservoir have a common axis and the gaugeassembly is adapted to be usedl in a variety of positions depending uponeach particular installation, or upon the arrangement of the pressrolls.v In any of these positions there will be a sump 59, 59a, or B4above the liquid in the reservoir it. vIi! the assembly is in ahorizontal position. the bent tube il is fixed support. Y

i o 2,440,118 I f used withthe open end uppermostinthe sump I8 legs;c avalve pin threaded inathe wali\of said as in, Figure il.' If .theassembly is vertical with coupling coacting with said seat; and saidsecond the sack at the top." no tube is used since the re' legconstructed and arranged to )alternately cess will be uppermost as in'Figure s. Ii.' the asmount a pressure sauge and a' liquid-chargingsemblyis vertical with the Seck at the bottom o gun whereby thevelvecari be opened to allow the tube 62a is used to extend into sump'eoacharging of che Sack from thefgun, then' closed as in Figure 4. In each0f these arrangements to seal liquid in the sack for removal of the gun.A the'SeCk een be Completely lied With the l10n next `cracked to purgeair from the sack,v again and ail'- oen be' purged 011i closed formounting o! the gauge and then opened of the Seek Since it willalweysrise t0 the een le for snowing the liquid moet on thefgauge in ssump at the month of the purge Outlet response to pressure exerted; onthe sack.

As pointed out above, the slots 23 in the sides of 2, In apressyreeapplying device including a the cylinder 22 are long enough t0prevdefsiight o housing having openings in the side wali thereof,clearences A and B upon each side of the wrist pin s, piston sndsbls nthe housmg's Wrlss pin on 2i.` In the event the gauge device 3@ isbroken l5 said piston projecting freely through the open'- end the uidShould leek out the Wrist pini 2| l. ings, aY removable heed on thehousing one o will move over into the clearance A and there nquidqemmmgsack between the head and pisn wm be no further movement between/'511eDiS- ton, the improvements of a liquid-charging and ton and cylinder butthe pressure exerted by the snpurgingcondult havlng s mso open end lnthrust'rod 25 Wm maintain the You '3 in Pressed 2@ the uppermost portionof the sack and a second contact with roll iii. In the event of ruptureof l open end outslde of the sack and headI a oou the elastic reservoir55 the same conditions will ,puns havlng s mst leg ssourod tothe secondexist, and the machine will continue to operate open and of the oondulwith the rolls pressedtogether in 'the desired manner. I '4, y Themanner of replacing the indicator device ln the Woll of he coupllngooaoblng wlth solo 3d and recharging the sack has hereinbefore beenseat, a pressure gauge oommuolootlng Wlth solo described, and it hasvbeen pointed out that these. second leg sold sack bolug removable fromthe ,Operations can be Carried out Without reieas' housing by removal ofthe head whereupon said ing the `pressure rod 2S. In the event ofrupture s@ Wrjsfpln engages the Walls of the houslng @en the head afterit has been repaired or a new under prsssllrs of 4thesack 55, or lf itis desired for any other logs to malntsln the piston and houslng ln presreason to replgce the sack, the cylinder head Ellis sure spplylngrslstlon, and ssld valve being mov removed and the Sack may be eaduyroplaoedm able against said seat to seal liquid in the sack saksubstituted for the one which. has been 3. In a pressure.appylg`devicerincludng ah and the 'parts asoembled therewith are bolted pressedby relative movement of the piston and back upon'l the cylinder and thehose 56 of the d@ head, the improvements of; o uld ohsrglng and shown inFigure 6 to 'recharge the sack with open ond ln the uppermost ,portlonof the sock the pressure fluid as described above' and a second open endoutside said head, a T- From the above descriptions it Wm be onder'coupling having a :drst ieg connected to and comstood that the inventionprovidesapressure gauge 45 munloatlng Wlth the second open end of soloassembly containing h5 drauho liquid in a do` conduit, a second leg atan angle to the rst leg, formano Sack for owing the liquid to oct on a athird leg aligned with the first leg, and a cenpressure indicator. Thesack has an inside control chamber common to and oommunloatlng tourarrangedto collect any trapped air or other' with the three lsgs of saidcoupling, s volvo seat oompressiblo uid above the mouth of o Purge 5obetween the Irst and second legs, a valve pin tubekand a Valve assemblyis provioed to ,Seal threaded into the third leg coasting with said ujdm the sack as Wen as to purge an' from the seat; and said second legconstructed and arsaok- Liquid Charging air purging and' sack To' rangedto alternately mount a pressure gauge and details of construction may bevaried through a placing operations can be accomplished without a uldohsrglng gun whereby the valvey oon be pressure screw gun is mounted inthe manner air-purging:v conduit for said sack having a rst lossofvtension or pressure exerted by the device 55 opened to ollovvollovrglng of the roservoll. from" embodying the assembly.

It wm' of course be understood that Various reservoir for removal of thegun, next cracked wide range without departing from the principles topurge au from the top of the rservoir again i of this invention and itis, therefore. not the pur- 60 closed for mounting of the gauge and thenpose to limit the patent granted hereon otheropened for allowing theuuid to act on tho gouge vvlss than nocessltotsdfby the soopo of the opl in response to pressure exerted on the sack.

pendsd Claims Y o l d. A pressure responsive device comprising a I claimas my invention: l l f generally cylindrically shaped, pliable, liquidconthe gun, 'then closed to retain the fluid in Vthe 1, In apressureapp1ying device mcludlng a 65 taining reservoir adapted to becompressed by a housing, a head on said housing, a, piston in the forceto be measured, said reservoir being proend outside of the sack; acoupling having a met Sump, and whereby on release of Such entrepped legconnected to said second end oi the conduit, air, said reservoir isentirely filled With'1iq111da second leg communicating-with the rst leg.5- A Pressure responsive device eomprising a and avalve seat between themet and second 75 deformable walled, uid containing reservoir adapted tobe compressed by a torce to be measured, said reservoir havin: anopening for iluid charging and air purging, said reservoir bein!provided with a plurality oi spaced sump portions in the inner surfacesthereof, said sumps being constructed and arranled so that in anyselected position oi said reservoir only one of said sump portions wilbe upermost, whereby on release ot entrapped air from said uppermostsump the reservoir is entirely illled with uid.

.LLOYD HORNBOBTEL.

REFERENCES CITED Number 1,417,462 1,424,666 1,523,526 1,576,6331,772,168 1,766,782 1,681,240 2,260,135 2.317.701 2,864,443

P UNITED STATES PATENTS Name Date Eason May 23, 1922 Eason Aug. 8, 1922Hedges Jan. 20, 1925 Dix Maru '16, 1926 Mason Aug. 5, 1930 Goldman June24, 1930 Pentz Oct. 4, 1932 Beecher Oct. 21, 1941- Ullman Apr. 27. 1943Hornbostel Dec. 5, 1944 FOREIGN PATENTS Country Date The followingreferences are oirecord in the l5 Number me of this patent.:

Great Britain Feb. 11, 1892

